phase: better error message when --force is needed
When trying to turn a draft changeset into a secret changeset, I was
told:
% hg phase -s .
cannot move 1 changesets to a more permissive phase, use --force
no phases changed
That message struck me as being backwards -- the secret phase feels
less permissive to me since it restricts the changesets from being
pushed.
We don't use the word "permissive" elsewhere, 'hg help phase' talks
about "lower phases" and "higher phases". I therefore reformulated the
error message to be
cannot move 1 changesets to a higher phase, use --force
That is not perfect either, but more in line with the help text. An
alternative could be
cannot move phase backwards for 1 changesets, use --force
which fits better with the help text for --force.
# changegroup.py - Mercurial changegroup manipulation functions
#
# Copyright 2006 Matt Mackall <mpm@selenic.com>
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.
from i18n import _
from node import nullrev, hex
import mdiff, util, dagutil
import struct, os, bz2, zlib, tempfile
_BUNDLE10_DELTA_HEADER = "20s20s20s20s"
def readexactly(stream, n):
'''read n bytes from stream.read and abort if less was available'''
s = stream.read(n)
if len(s) < n:
raise util.Abort(_("stream ended unexpectedly"
" (got %d bytes, expected %d)")
% (len(s), n))
return s
def getchunk(stream):
"""return the next chunk from stream as a string"""
d = readexactly(stream, 4)
l = struct.unpack(">l", d)[0]
if l <= 4:
if l:
raise util.Abort(_("invalid chunk length %d") % l)
return ""
return readexactly(stream, l - 4)
def chunkheader(length):
"""return a changegroup chunk header (string)"""
return struct.pack(">l", length + 4)
def closechunk():
"""return a changegroup chunk header (string) for a zero-length chunk"""
return struct.pack(">l", 0)
class nocompress(object):
def compress(self, x):
return x
def flush(self):
return ""
bundletypes = {
"": ("", nocompress), # only when using unbundle on ssh and old http servers
# since the unification ssh accepts a header but there
# is no capability signaling it.
"HG10UN": ("HG10UN", nocompress),
"HG10BZ": ("HG10", lambda: bz2.BZ2Compressor()),
"HG10GZ": ("HG10GZ", lambda: zlib.compressobj()),
}
# hgweb uses this list to communicate its preferred type
bundlepriority = ['HG10GZ', 'HG10BZ', 'HG10UN']
def writebundle(cg, filename, bundletype):
"""Write a bundle file and return its filename.
Existing files will not be overwritten.
If no filename is specified, a temporary file is created.
bz2 compression can be turned off.
The bundle file will be deleted in case of errors.
"""
fh = None
cleanup = None
try:
if filename:
fh = open(filename, "wb")
else:
fd, filename = tempfile.mkstemp(prefix="hg-bundle-", suffix=".hg")
fh = os.fdopen(fd, "wb")
cleanup = filename
header, compressor = bundletypes[bundletype]
fh.write(header)
z = compressor()
# parse the changegroup data, otherwise we will block
# in case of sshrepo because we don't know the end of the stream
# an empty chunkgroup is the end of the changegroup
# a changegroup has at least 2 chunkgroups (changelog and manifest).
# after that, an empty chunkgroup is the end of the changegroup
empty = False
count = 0
while not empty or count <= 2:
empty = True
count += 1
while True:
chunk = getchunk(cg)
if not chunk:
break
empty = False
fh.write(z.compress(chunkheader(len(chunk))))
pos = 0
while pos < len(chunk):
next = pos + 2**20
fh.write(z.compress(chunk[pos:next]))
pos = next
fh.write(z.compress(closechunk()))
fh.write(z.flush())
cleanup = None
return filename
finally:
if fh is not None:
fh.close()
if cleanup is not None:
os.unlink(cleanup)
def decompressor(fh, alg):
if alg == 'UN':
return fh
elif alg == 'GZ':
def generator(f):
zd = zlib.decompressobj()
for chunk in util.filechunkiter(f):
yield zd.decompress(chunk)
elif alg == 'BZ':
def generator(f):
zd = bz2.BZ2Decompressor()
zd.decompress("BZ")
for chunk in util.filechunkiter(f, 4096):
yield zd.decompress(chunk)
else:
raise util.Abort("unknown bundle compression '%s'" % alg)
return util.chunkbuffer(generator(fh))
class unbundle10(object):
deltaheader = _BUNDLE10_DELTA_HEADER
deltaheadersize = struct.calcsize(deltaheader)
def __init__(self, fh, alg):
self._stream = decompressor(fh, alg)
self._type = alg
self.callback = None
def compressed(self):
return self._type != 'UN'
def read(self, l):
return self._stream.read(l)
def seek(self, pos):
return self._stream.seek(pos)
def tell(self):
return self._stream.tell()
def close(self):
return self._stream.close()
def chunklength(self):
d = readexactly(self._stream, 4)
l = struct.unpack(">l", d)[0]
if l <= 4:
if l:
raise util.Abort(_("invalid chunk length %d") % l)
return 0
if self.callback:
self.callback()
return l - 4
def changelogheader(self):
"""v10 does not have a changelog header chunk"""
return {}
def manifestheader(self):
"""v10 does not have a manifest header chunk"""
return {}
def filelogheader(self):
"""return the header of the filelogs chunk, v10 only has the filename"""
l = self.chunklength()
if not l:
return {}
fname = readexactly(self._stream, l)
return dict(filename=fname)
def _deltaheader(self, headertuple, prevnode):
node, p1, p2, cs = headertuple
if prevnode is None:
deltabase = p1
else:
deltabase = prevnode
return node, p1, p2, deltabase, cs
def deltachunk(self, prevnode):
l = self.chunklength()
if not l:
return {}
headerdata = readexactly(self._stream, self.deltaheadersize)
header = struct.unpack(self.deltaheader, headerdata)
delta = readexactly(self._stream, l - self.deltaheadersize)
node, p1, p2, deltabase, cs = self._deltaheader(header, prevnode)
return dict(node=node, p1=p1, p2=p2, cs=cs,
deltabase=deltabase, delta=delta)
class headerlessfixup(object):
def __init__(self, fh, h):
self._h = h
self._fh = fh
def read(self, n):
if self._h:
d, self._h = self._h[:n], self._h[n:]
if len(d) < n:
d += readexactly(self._fh, n - len(d))
return d
return readexactly(self._fh, n)
def readbundle(fh, fname):
header = readexactly(fh, 6)
if not fname:
fname = "stream"
if not header.startswith('HG') and header.startswith('\0'):
fh = headerlessfixup(fh, header)
header = "HG10UN"
magic, version, alg = header[0:2], header[2:4], header[4:6]
if magic != 'HG':
raise util.Abort(_('%s: not a Mercurial bundle') % fname)
if version != '10':
raise util.Abort(_('%s: unknown bundle version %s') % (fname, version))
return unbundle10(fh, alg)
class bundle10(object):
deltaheader = _BUNDLE10_DELTA_HEADER
def __init__(self, repo, bundlecaps=None):
"""Given a source repo, construct a bundler.
bundlecaps is optional and can be used to specify the set of
capabilities which can be used to build the bundle.
"""
# Set of capabilities we can use to build the bundle.
if bundlecaps is None:
bundlecaps = set()
self._bundlecaps = bundlecaps
self._changelog = repo.changelog
self._manifest = repo.manifest
reorder = repo.ui.config('bundle', 'reorder', 'auto')
if reorder == 'auto':
reorder = None
else:
reorder = util.parsebool(reorder)
self._repo = repo
self._reorder = reorder
self._progress = repo.ui.progress
def close(self):
return closechunk()
def fileheader(self, fname):
return chunkheader(len(fname)) + fname
def group(self, nodelist, revlog, lookup, units=None, reorder=None):
"""Calculate a delta group, yielding a sequence of changegroup chunks
(strings).
Given a list of changeset revs, return a set of deltas and
metadata corresponding to nodes. The first delta is
first parent(nodelist[0]) -> nodelist[0], the receiver is
guaranteed to have this parent as it has all history before
these changesets. In the case firstparent is nullrev the
changegroup starts with a full revision.
If units is not None, progress detail will be generated, units specifies
the type of revlog that is touched (changelog, manifest, etc.).
"""
# if we don't have any revisions touched by these changesets, bail
if len(nodelist) == 0:
yield self.close()
return
# for generaldelta revlogs, we linearize the revs; this will both be
# much quicker and generate a much smaller bundle
if (revlog._generaldelta and reorder is not False) or reorder:
dag = dagutil.revlogdag(revlog)
revs = set(revlog.rev(n) for n in nodelist)
revs = dag.linearize(revs)
else:
revs = sorted([revlog.rev(n) for n in nodelist])
# add the parent of the first rev
p = revlog.parentrevs(revs[0])[0]
revs.insert(0, p)
# build deltas
total = len(revs) - 1
msgbundling = _('bundling')
for r in xrange(len(revs) - 1):
if units is not None:
self._progress(msgbundling, r + 1, unit=units, total=total)
prev, curr = revs[r], revs[r + 1]
linknode = lookup(revlog.node(curr))
for c in self.revchunk(revlog, curr, prev, linknode):
yield c
yield self.close()
# filter any nodes that claim to be part of the known set
def prune(self, revlog, missing, commonrevs, source):
rr, rl = revlog.rev, revlog.linkrev
return [n for n in missing if rl(rr(n)) not in commonrevs]
def generate(self, commonrevs, clnodes, fastpathlinkrev, source):
'''yield a sequence of changegroup chunks (strings)'''
repo = self._repo
cl = self._changelog
mf = self._manifest
reorder = self._reorder
progress = self._progress
# for progress output
msgbundling = _('bundling')
mfs = {} # needed manifests
fnodes = {} # needed file nodes
changedfiles = set()
# Callback for the changelog, used to collect changed files and manifest
# nodes.
# Returns the linkrev node (identity in the changelog case).
def lookupcl(x):
c = cl.read(x)
changedfiles.update(c[3])
# record the first changeset introducing this manifest version
mfs.setdefault(c[0], x)
return x
# Callback for the manifest, used to collect linkrevs for filelog
# revisions.
# Returns the linkrev node (collected in lookupcl).
def lookupmf(x):
clnode = mfs[x]
if not fastpathlinkrev:
mdata = mf.readfast(x)
for f, n in mdata.iteritems():
if f in changedfiles:
# record the first changeset introducing this filelog
# version
fnodes[f].setdefault(n, clnode)
return clnode
for chunk in self.group(clnodes, cl, lookupcl, units=_('changesets'),
reorder=reorder):
yield chunk
progress(msgbundling, None)
for f in changedfiles:
fnodes[f] = {}
mfnodes = self.prune(mf, mfs, commonrevs, source)
for chunk in self.group(mfnodes, mf, lookupmf, units=_('manifests'),
reorder=reorder):
yield chunk
progress(msgbundling, None)
mfs.clear()
needed = set(cl.rev(x) for x in clnodes)
def linknodes(filerevlog, fname):
if fastpathlinkrev:
ln, llr = filerevlog.node, filerevlog.linkrev
def genfilenodes():
for r in filerevlog:
linkrev = llr(r)
if linkrev in needed:
yield filerevlog.node(r), cl.node(linkrev)
fnodes[fname] = dict(genfilenodes())
return fnodes.get(fname, {})
for chunk in self.generatefiles(changedfiles, linknodes, commonrevs,
source):
yield chunk
yield self.close()
progress(msgbundling, None)
if clnodes:
repo.hook('outgoing', node=hex(clnodes[0]), source=source)
def generatefiles(self, changedfiles, linknodes, commonrevs, source):
repo = self._repo
progress = self._progress
reorder = self._reorder
msgbundling = _('bundling')
total = len(changedfiles)
# for progress output
msgfiles = _('files')
for i, fname in enumerate(sorted(changedfiles)):
filerevlog = repo.file(fname)
if not filerevlog:
raise util.Abort(_("empty or missing revlog for %s") % fname)
linkrevnodes = linknodes(filerevlog, fname)
# Lookup for filenodes, we collected the linkrev nodes above in the
# fastpath case and with lookupmf in the slowpath case.
def lookupfilelog(x):
return linkrevnodes[x]
filenodes = self.prune(filerevlog, linkrevnodes, commonrevs, source)
if filenodes:
progress(msgbundling, i + 1, item=fname, unit=msgfiles,
total=total)
yield self.fileheader(fname)
for chunk in self.group(filenodes, filerevlog, lookupfilelog,
reorder=reorder):
yield chunk
def revchunk(self, revlog, rev, prev, linknode):
node = revlog.node(rev)
p1, p2 = revlog.parentrevs(rev)
base = prev
prefix = ''
if base == nullrev:
delta = revlog.revision(node)
prefix = mdiff.trivialdiffheader(len(delta))
else:
delta = revlog.revdiff(base, rev)
p1n, p2n = revlog.parents(node)
basenode = revlog.node(base)
meta = self.builddeltaheader(node, p1n, p2n, basenode, linknode)
meta += prefix
l = len(meta) + len(delta)
yield chunkheader(l)
yield meta
yield delta
def builddeltaheader(self, node, p1n, p2n, basenode, linknode):
# do nothing with basenode, it is implicitly the previous one in HG10
return struct.pack(self.deltaheader, node, p1n, p2n, linknode)